fix: GUI max-width on wrapper + visible TTS swap result + warning cleanup

GUI MAX-WIDTH (was still stretched)

Root cause v2: my earlier rule applied max-width to #header and main
INDIVIDUALLY, but they live inside <Container fluid id="wrapper"> from
svelteui which goes full viewport width. Both children inherited that
full width from the flex layout. Constraining each child wouldn't help
when their PARENT was unconstrained.

Fix: max-width:1280px !important on #wrapper itself, with margin:0 auto.
Now the whole app (header + main) sits in a centred 1280px column on
wide monitors. !important is unfortunate but Container's width:100%
sometimes wins under HMR otherwise.

VISIBLE TTS SWAP RESULT (was failing silently)

User saved 'Piper' in dropdown → green 'Saved!' banner → active engine
chip still showed 'sapi'. Root cause: when Piper isn't installed,
`tts::build_backend("piper")` falls back to SAPI internally, but
`set_tts_backend` just logged a warning and returned a generic string.
The GUI couldn't tell the difference between success and silent fallback.

Fix:
- `set_tts_backend` now returns `TtsSwapResult { requested, applied,
  fell_back, note }`. The Svelte page reads `applied` (actual installed
  backend), checks `fell_back`, and shows an ORANGE notification with
  the concrete fix ("запусти tools/piper/install.ps1 чтобы скачать
  бинарь") instead of a green 'saved' lie.
- Saves now also call `refreshActiveBackends()` so the live chip
  ("Активный движок: TTS: sapi") updates without page reload.
- Green notification when swap succeeded normally.

WARNING CLEANUP

- jarvis-app/main.rs: removed unreachable `_ => {}` arm (all IpcAction
  variants are explicit now).
- jarvis-app/tray.rs: moved `info!("Tray initialized.")` to BEFORE the
  Windows message-pump loop (the loop runs forever, so the original
  position was unreachable).
- jarvis-gui/main.rs: dropped unused #[macro_use] on simple_log.
- jarvis-gui/events.rs: #[allow(dead_code)] on Payload struct +
  EventTypes impl + `play` fn — they're intentional API surface for
  future event-emitter wiring, not actual dead code.
- Plus a `cargo fix` pass for misc unused imports.

Down from 12 warnings to 1 (npm-build-completion notice — informational).

Tests: 140 rust + 115 python (was 104, +11 for new wave59_handlers).
Release builds of jarvis-app + jarvis-gui both green.

frontend/src/routes/settings/index.svelte

@@ -138,12 +138,30 @@
         }
     }
 
+    interface TtsSwapResult {
+        requested: string
+        applied: string
+        fell_back: boolean
+        note: string | null
+    }
+
+    let ttsSwapInfo: TtsSwapResult | null = null
+
     async function applyTtsBackend(target: string) {
+        backendSwapError = ""
+        ttsSwapInfo = null
         try {
             // 1. GUI Tauri command — persists to DB + hot-swaps GUI's TTS.
-            await invoke<string>("set_tts_backend", { name: target })
+            //    Returns the actual installed backend (may differ from
+            //    requested if Piper/Silero unavailable → fell back to SAPI).
+            const res = await invoke<TtsSwapResult>("set_tts_backend", { name: target })
+            ttsSwapInfo = res
             // 2. Tell the running daemon (separate process) to switch too.
             switchDaemonTts(target || "auto")
+            // 3. Refresh the "Активный движок" chip — without this, the user
+            //    saves Piper, sees "saved!", but the active label stays SAPI
+            //    because we never re-read the live engine.
+            await refreshActiveBackends()
         } catch (err) {
             backendSwapError = String(err)
         }
@@ -453,9 +471,31 @@
             >
                 {backendSwapError}
             </Notification>
+            <Space h="md" />
         {/if}
 
-        <Space h="md" />
+        {#if ttsSwapInfo && ttsSwapInfo.fell_back}
+            <Notification
+                title="TTS откатился на {ttsSwapInfo.applied.toUpperCase()}"
+                color="orange"
+                withCloseButton={true}
+                on:close={() => { ttsSwapInfo = null }}
+            >
+                Запросил <strong>{ttsSwapInfo.requested}</strong> — недоступен.
+                {#if ttsSwapInfo.note}<br/>{ttsSwapInfo.note}{/if}
+            </Notification>
+            <Space h="md" />
+        {:else if ttsSwapInfo && !ttsSwapInfo.fell_back}
+            <Notification
+                title="TTS переключён на {ttsSwapInfo.applied.toUpperCase()}"
+                color="teal"
+                withCloseButton={true}
+                on:close={() => { ttsSwapInfo = null }}
+            >
+                Применено сразу — без перезапуска.
+            </Notification>
+            <Space h="md" />
+        {/if}
 
         <InputWrapper label={t('settings-llm-context') || 'Контекст разговора'}>
             <Text size="sm" color="gray">